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Observation of collectivity enhanced magnetoassociation of 6 Li in the quantum degenerate regime

Naniyil, Vineetha; Zhou, Yijia; Simmonds, Guy; Cooper, Nathan; Li, Weibin; Hackermüller, Lucia

Observation of collectivity enhanced magnetoassociation of 6 Li in the quantum degenerate regime Thumbnail


Vineetha Naniyil

Yijia Zhou

Guy Simmonds

Associate Professor


The association process of Feshbach molecules is well described by a Landau-Zener transition above the Fermi temperature, such that two-body physics dominates the dynamics. However, using 6 Li atoms and the associated Feshbach resonance at B r = 834.1G, we observe an enhancement of the atom-molecule coupling as the Fermionic atoms reach degeneracy, demonstrating the importance of many-body coherence not captured by the conventional Landau-Zener model. In the experiment, we apply a linear association ramp ranging from adiabatic to non-equilibrium molecule association for various temperatures. We develop a theoretical model that explains the temperature dependence of the atom-molecule coupling. Furthermore, we characterize this dependence experimentally and extract the atom-molecule coupling coefficient as a function of temperature, finding qualitative agreement between our model and experimental results. In addition, we simulate the dynamics of molecular association during a nonlinear field ramp. We find that, in the non-equilibrium regime, molecular association efficiency can be enhanced by sweeping the magnetic field cubically with time. Accurate measurement of the atom-molecule coupling coefficient is important for both theoretical and experimental studies of molecular association and many-body collective dynamics.

Journal Article Type Article
Acceptance Date Oct 19, 2022
Online Publication Date Nov 3, 2022
Publication Date Nov 3, 2022
Deposit Date Oct 19, 2022
Publicly Available Date Nov 3, 2022
Journal New Journal of Physics
Electronic ISSN 1367-2630
Peer Reviewed Peer Reviewed
Volume 24
Article Number 113005
Public URL
Publisher URL


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